Question

What is an equation for the line that passes through points (–1, –4) and (1, 4)? Write the equation in slope-intercept form. (2 points)

Answer 1

y = mx + b

m=(y2-y1)/(x2-x1)

Answer 2

@lolly wanna try

Answer 3

no..but i will..:)

Answer 4

(1,-4), m = -4
y = mx + b
Sub to find b
-4 = -4*1 + b
b = 0
-------
y = -4x
m = -4 means slope = -4.

slope-intercept form of equation of a straight line is y = mx + b.

m is the slope.

b is the y-intercept.

your equation starts of with the slope-intercept generic form of y = mx + b

replace m with -4 to get y = -4x + b

your line goes through the point (x,y) = (1,-4)

that means the x-coordinate is 1 and the y coordinate is -4.

to find the y-intercept, you replace y with -4 and x with 1 in the equation and solve for b.

your equation of y = -4x + b becomes:

-4 = (-4 * 1) + b

Answer 5

can you set up the equation? then ill solve:P

Answer 6

@swiftskier96 is that the answer http://www.algebra.com/algebra/homework/Graphs/Graphs.faq.question.233716.html hahaha

Answer 7

(x1,y1) = (–1, –4)
(x2,y2) = (1, 4)

Answer 8

soo y=mx=b? isnt that for finding slope?

Answer 9

yes but you need to find m 1st
\[y=\frac{ y2-y1 }{ x2-x1 }\]

Answer 10

meant m =

Answer 11

ook ill try it..hold on..:)

Answer 12

m=-6

Answer 13

now what?

Answer 14

show me how?

Answer 15

m is wrong :D

Answer 16

really?

Answer 17

m= 1-4/-1--4.
m=-3/3
m=-6

Answer 18

(x1,y1) = (–1, –4)
(x2,y2) = (1, 4)
x1 = -1
y1 = -4
x2 = 1
y2 = 4

Answer 19

hi lolly :P

Answer 20

right..thats what i did..,.i think..?

Answer 21

hi..:)

Answer 22

(y-y1)/(y2-y1)=(x-x1)/(x2-x1)

Answer 23

@surdawi how did i do it rong?

Answer 24

(4- - 4)/(1- -1)= 8/2=4

Answer 25

so m is 4?

Answer 26

what you did (x2-y2)/(x1-y1)

Answer 27

well i thought it was -6..but its not..?

Answer 28

m = 4

now you choose wither point and solve for b
y = 4x + b

Answer 29

k hold on ill try again..:)

Answer 30

\[m=\frac{ y2-y1 }{ x2-x1 }=\frac{ 4- -4 }{ 1- -1 }=\frac{ 8 }{ 2 }=\]

Answer 31

for slope
slope=(y2-y1)/(x2-x1)
it can be directly solve see the formula that i have given already

Answer 32

(y-y1)/(y2-y1)=(x-x1)/(x2-x1)

Answer 33

oooh!!! i got the x1and 2s switched up..ok i see..:)

Answer 34

the one with less numbers right?

Answer 35

there is no zeros for x or y this time so pick one and solve, it doesnt matter which one

Answer 36

which one would be easier?

Answer 37

either, same thing

Answer 38

k ill do the one with less numbers..:P

Answer 39

so 4=4x1=b? 4=b..but we already knew that..

Answer 40

both of them has same amount of numbers :p

4=4x1=b? !
why is there an equal to b

Answer 41

oooh! whoop..my bad..:)

Answer 42

so 4=4+4...

Answer 43

4=8? that dosent make sense...

Answer 44

4=4x1+ b
what is x1 = ?

Answer 45

-1

Answer 46

y1 =?

Answer 47

-1

Answer 48

000h!!!

Answer 49

no it dosent..:)

Answer 50

-4

Answer 51

it should be one of the pairs either (1,4) or (-1,-4)

-4 = 4*(-1) + b

Answer 52

-4=4x-1=4?

Answer 53

4*-1=?

Answer 54

-4

Answer 55

-4 = -4 + b
how can you keep b on one side?

Answer 56

by adding 4 to b?

Answer 57

ok show me how?

Answer 58

-4=-4+b (then the 4 crosses out)
+4 +4

Answer 59

-4 +4 = -4 + 4 +b
0 = b

y = 4x + 0

Answer 60

where did the other set of -4=4 come from?

Answer 61

you have to add 4 to both sides

Answer 62

passes through points (–1, –4) and (1, 4)?

Answer 63

Anamaria what grade you in?

Answer 64

10.:)

Answer 65

you should know how to add :P

Answer 66

lol i do know how to add:)

Answer 67

-4=-4+b (then the 4 crosses out)
+4 +4

was this rong?

Answer 68

lol @surdawi u sleeping?

Answer 69

i went to pray